Apparatus for crush dressing grinding wheels



Dec. 21, 1948. J. (3. WILSON 2,456,762

APPARATUS FOR CRUSH, DRESSING GRINDING WHEELS Filed Sept. 27, 1945 2Sheets-Sheef 1 mvEnToR a JOHN 0. WILSON ATTORNEYS Dec. 21, 1948. J. c.WILSON 2,456,762

- APPARATUS FOR CRUSH DRESSING'GRINDING WHEELS Filed Sept. 27, 1945 2Sheets-Sheet 2 INVENTUR JOHN 0. WILSON EH HTTD RNEH E Patented Dec. 21,1948 APPARATUS-FOR cRUsH-nnEssme GRINDING WHEELS John C. Wilson,Springfield, :Qhio, assignor *to The Thompson Grinder(iompanygspringfiem, Ohio, a summation of .0hio

Annlicationldep ember 27, 1.945?2 SerialN 618.8

1-6 Claims. I

This invention relates to methods and apparatus for the dressing ofgrinding wheels which are especially hard such as diamond grit wheels.

The primary object of this invention ,is to provide a method andapparatus ,jor the satisfactory dressing of diamond grit wheels.

Another object is 30. provide a method and apparatus for .crush dressingdiamond grit wheels.

Still another obiect is to provirlea method and; apparatus ,forsuccessively transierring configurations to harder ro'll members until.the final roll will satisfactorily crush dress a diamond grit wheel,

These and other objects and advantages bccome more apparent ,upon.rererence to the following specification taken together with theaccompanying drawings in which:

Figure 1 is a perspective view illustrating the elements of a machineadapted for practicing themethodsof this invention;

ur s a s de e evati h win the whee in a grindin g p0$i'lii0n;

Figure 3 is a view similar to H3 36 2 "but showing the wheel being crushdressed;

u e-41 a. sjtio ta n. along th lin of Figure 1 showing the glutenemployed when. the .wheel is. driven at low speeds; v

Figure 5 is, a section indicated by line 1-1.; on

Eigure 2 showing a configuration being transferred to an intermediatedressing roll, and

E gure '6 is a view taken along the line of; 5-18 on Figure '3 showingthe diamond ,grit wheel in the processof "being crush dressed R fe rin tthe. draw n s. It. indicates, th table for supporting a workpiece. f2which is to be ground by a wheel M, the .wheel .and' table;

being relatively reciprocable.

"The wheel "I4 is carried on a shaft, Ni which; is adapted for beingdriven at grinding speeds bya motor 18. H5, through an over-runningclutch "2'0, isra motor 22 which drives into the said shaft through reduction gearing.

the motor '18 is energized, the clutch at 20 'disengages the motor 22from theshaft 1-6 and t'hef wheel may be driven at high surface speed.

a vitrified or resinous bonding compound.

Also-carriod'on'the barieer to mbracketjj; r isa roller 26 comprisingpwdcles-of silicon caralso connected with the, sham when the motor 13 isdei energized-the motor '22 may be energized to drive the wheel I4 atreduced surface speeds. when bide which are preferably bonded togetherwith a vitrified composition. While the wheel [4 having the diamond grittherein is too hard to be crush formed by a steel roller, the vitrifiedsilicon carbide roller 26 is sufficiently hard to perform thisoperation. In turn, the roller 26 may be formed by bringing it intocrushing engagement with a steel roller.

Such a steel roller is indicated at 28 and a means for supporting theroller 28 is shown at 30. The table 30 is slidable so as selectively tobring the roller 28 into crushing engagement with the roller 26. Theroller 26 is freely mounted inits supporting bracket 24 while the roller28 is adapted for being driven in rotation by a motor 30 workpiece l2,while the roller 28 is being urged 1 tion is, therefore, an importantoperation.

stated before, the diamond grit wheel may be crushed to shape by avitrified silicon carbide roller.

either by turning or grinding or any desirable into engagement with theroller 26. After the roller 26 has been crush formed to the desiredshape, the roller 28 and its support 3!! is retracted .to their Figure 3position. Thereafter, when it is desired to dress the wheel l4, it maybe moved into position over the roller 26 and driven at low speed by themotor 22 while being urged against the said roller. After the wheel hasbeen dressed, a new grinding cycle may be instituted and, if

necessary, the roll 26 may again be trued by the wears slowly,substantially eliminates cracking and checking of the carbide tool tipand, because of its free-cutting action, generates very little heat inthe tool being ground. The precise trueing of'a diamond grit wheel to adesired configuraroller and, in turn, the silicon carbide roller can becrushed to shape by a sufficiently hard steel The steel roller is, inits turn, formed combination thereof.

n Thus, by forming a first roller to a predeterf mined configuration "byordinary machine mth ode and thereafter successivelytransferring that'able or necessary. In each case, however, the first roll would bemachine worked to have the desired configuration on its surface, and theintermediate rollers and wheel finally to be dressed would be.

of a substance or composition capable of being shaped by the applicationof pressure.

It will be understood that various modifications and arrangements instructure could be made;

without departing from the spirit of my invention and, accordingly, Idesire to comprehend such modifications and substitutions of equivalentsas may be considered to come within the scope of the appended claims.

I claim:

1. In a grinding machine; a work-table; a grinding wheel movablerelative to said work table; a dressing roller on said table;intermediate roller means on said table adapted to be shaped by theapplication of pressure thereto; means for transferring-theconfiguration of said dressing roller to said intermediate roller meansby bringing the same together under pressure and then rotating the saidrollers at the same surface speeds; and means for transferring the saidconfiguration from said intermediate roller means to said grinding wheelby bringing the same together under pressure and then rotating them atthe same surface speeds.

In a grinding machine having a work table,

a grinding wheel movable relative to said WOI'K" table, a grinding wheelcrush dressing roller mounted on said work table and adapted to engagesaid grinding wheel, a second crush dressing roller mounted on saidtable, means for moving said second roller on said table into pressurecrush dressing engagement with said first mentioned roller, and meansfor effecting relative rotation of said rollers when in pressureengagement. 1

3. In a grinding machine having a work table, a grinding wheel movablerelative to said work table, a grinding Wheel crush dressing rollermounted on said work table and adapted to engage said grinding wheel, asecond crush dressingroller mounted on said table, means for moving saidsecond roller on said table into pressure crush dressing engagement withsaid first mentioned roller, and means for effecting relative rotationof said rollers when in pressure engagement, said first mentioned rollerbeing mounted on said table with its working surface in planar alignmentwith" the surface of a finished workpiece on the table,

4. In a grinding machine having a work table, a grinding wheel movablerelative to said worktable, a grinding wheel crush dressing rollervmounted on said work table in a predetermined relationship to a workpiece on said table to be ground by said grinding wheel, a second crushdressing roller for said first mentioned roller movably mounted on saidtable relative to said first mentioned roller, and power means foreffecting relative rotation of said rollers when in engagement.

5. In a grinding machine, having a grindingwheel, and a bed, a pluralityof crush dressing; rollers mounted on said bed, means for effectingrelative movement between said rollers to bring the respective rollerssuccessively into engagement with one another, and means to efiectengagement of said grinding wheel with the one of said rollers lastengaged by another of said rollers.

6. In a grinding machine, a rotatable grinding wheel mounted on saidmachine, a dressing wheel mounted on said machine, means for efiectingpressure engagement between said grinding and dressing wheels to effecta crushdressingof said grinding wheel, a crush dressing roller alsomounted on said machine, power means for rotating said roller, means forforcing said roller into pressure crush dressing engagement with saiddressing wheel, and a work support associated with said machine forsupporting a work piece in a predetermined relationship to said dressingwork table, a crushdressing rollerrotatably jour-.

naled onsaid table, means for moving said roller into crush dressingpressure engagement with said dressing wheel, and power meansforrotatably driving said roller when in engagement'with said dressingwheel. r

8. In a horizontal surface grinding machine having a horizontal work'table, a rotatable grinding wheel mounted above said table, means forrelatively reciprocating said table and wheel, a grinding wheel truingdevice mounted on said table with the working party of its surface 10*cated in a predetermined position relative to a work surface to bemachined on a workpiece on said work table, a second truing devicemounted on said work table including means for rela tively moving saidsecond truing device hori-.

zontally on said table into engagement with said first mentioned truingdevice so as to effect a truing operationon said first mentioned truingdevice, said first mentioned truing device "being operable to effect atruing v operation on said grinding wheel when moved into pressureengagement therewith. g l o 9, .In a grinding machine having awork tableand a grinding wheel adjustablerelative thereto, a truing device on thework table of said machine adapted to be engaged by. said grinding wheelfor effecting a truing thereof, and a second truing device for truingsaid first, mentioned truing device on said 'work'table, and means forselectively positioning said grinding wheel relative to said firstmentioned truing device, and

said second mentioned truing device relative to said first mentionedtruing device to bring the same into operative relationship to effect aform ing of said grinding wheel to the configuration of said secondmentioned truing device by transfer of the desired form through saidfirst mentioned truing device, and means on said work table forpositioning a workpiece with its surface to be ground in a predeterminedrelationship to the surface of engagement of said grind-- ing wheelwithsaid first mentioned truing device.

journaled on said table .in position to engage said grinding, wheel, a.steel roller movably;v

mounted on said tabla-means for moving said steel roller into pressureengagement. with said silicon carbide roller, means for driving saidsteel roller when in engagement with said silicon -can.

10. In a grinding machine-having a work table; a rotatable grindingwheel adjustable relative to said table, a vitrified silicon carbideroller bide roller, and means for rotating said grinding wheel at a slowspeed when in engagement with said silicon carbide roller.

11. In a grinding machine having a work table, a rotatable grindingwheel adjustable relative to said table, a vitrified silicon carbideroller journaled on said table in position to engage said grindingwheel, a steel roller movably mounted on said table, means for movingsaid roller into pressure engagement with said silicon carbide roller,means for driving said steel roller when in engagment with said siliconcarbide roller, means for rotating said grinding wheel at a slow speedwhen in engagement with said silicon carbide roller, and means formounting a workpiece on said work table with its surface to be groundlocated in a predetermined relationship to said silicon carbide roller,whereby relative reciprocation of said work table and grinding wheelwill present said grinding wheel selectively to said workpiece or tosaid vitrified silicon carbide roller.

12. In a grinding machine; a grinding wheel; means for driving saidwheel at grinding speed or at crushing speed; a work table reciprocablerelative to said wheel; a first dressing roller adapted for being shapedby pressure rotatably mounted on said table; a second dressing rollerrotatably and reciprocably mounted on said table; means for moving saidsecond roller into pressure engagement with said first roller and fordriving said second roller in rotation to form said first roller todesired shape; and means for moving said wheel and first roller intopressure engagement and for driving said wheel at crushing speed forshaping said wheel.

13. In a grinding machine having a grinding wheel and a worktable, afirst crush dressing roller on said table adapted to crush form saidwheel by pressure engagement therewith, a second crush dressing rolleron said table adapted to crush form said first roller by pressureengagement therewith, means for relatively moving said rollers on saidtable to bring them into pressure contact to crush form the firstthereof, and power means for driving said rollers when in crushingengagement.

14. In a grin-ding machine having a work supporting table and arotatable grinding wheel, a dressing wheel mounted on said tableoperable to dress said grinding wheel upon pressure engagementtherewith, a crush dressing roller movably mounted on said table, powermeans for rotating said roller, means for forcing said roller intopressure crush dressing engagement with said dressing wheel, and meansfor supporting a workpiece on said table in a predetermined relationshipto said dressing wheel, said grinding wheel and table being relativelyadjustable to bring S d grindin wheel into working relationship withsaid workpiece or into position for pressure engagement of said grindingwheel with said dressing wheel.

15. In a grinding machine having a grinding wheel and a work table, afirst crush dressing roller having a configuration complementary to thatof the grinding wheel and adapted for forming said wheel by pressureengagement therewith, said first roller being mounted on said table in apredetermined position relative to a surface to be ground on a workpieceon said table, a second crush dressing roller also mounted on said tableand having a configuration complementary to that of said first rollerand adapted for shaping said first roller by pressure engagementtherewith, means for driving said grinding wheel and first roller atequal surface speeds while in pressure engagement to shape said wheel bysaid first roller, and means for bringing said first and second rollersinto crush dressing engagement and for driving said rollers at equalsurface speeds,

16. In a grinding machine having a grinding wheel and a work table, afirst crush dressing roller mounted on said table having a configurationcomplementary to that of the grinding wheel and located in apredetermined position relative to a surface to be ground on a workpieceon said table, a second crush dressing roller having a configurationcomplementary to that of said first roller and adapted to crush formsaid first roller by pressure contact therewith, said first roller beingadapted for crush forming said grinding wheel by pressure contacttherewith, means for driving said grinding wheel and said first rollerat equal surface speeds, means for bringing said first and secondrollers into crush dressing engagement, and means for driving saidrollers at equal surface speeds, said grinding wheel and table beingrelatively adjustable for selectively positioning said grinding wheel inoperative relationship with said first roller or with a workpiece insaid machine.

JOHN C. WILSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,440,338 Buswell Dec. 26, 19221,513,758 Hanson Nov. 4, 1924 1,896,533 Vuilleumier Feb. 7, 19332,385,644 Polk Sept. 25, 1945

